Mechanochemical approach to get layered double hydroxides: Mechanism explore on crystallite growth

被引:20
作者
Zeng, Mei-Gui [1 ]
Huo, Xiao-Lei [1 ]
Liu, Su-Qing [1 ]
Li, Shu-Ping [1 ]
Li, Xiao-Dong [1 ]
机构
[1] Nanjing Normal Univ, Coll Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Nanjing 210023, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Reactions in solid state; Layered double hydroxides; Hydrothermal treatment; SIZE; NANOPARTICLES; ADSORPTION; PARTICLES;
D O I
10.1016/j.apsusc.2013.12.093
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, the mechanochemical approach, which includes solid state reactions and hydrothermal treatment, has been proposed to synthesize magnesium-aluminum-layered double hydroxides (Mg-Al-LDHs). Specially, the reaction process of solid state reactions has been explored, and it presents that crystallite growth is the rate-controlling process. The hydrothermal treatment is performed after solid state reactions, on one hand, the crystallinity and monodispersity of final LDHs particles can be improved, on the other hand, such treatment can tailor the particle size efficiently. Furthermore, the relationship between particle size and hydrothermal conditions (time and temperature) has been systematically investigated, which indicates that the particle size and monodispersity can be effectively controlled. The crystallite growth along a-b plane and c-axis has been emphatically discussed, and the results show that under relatively low temperatures such as 100 degrees C, the gradual growth along c-axis has been found in the range of 48 h, and high temperatures will hider its growth on the contrary. Crystal growth along a-b plane could be accelerated by higher hydrothermal temperature and longer treatment time. Our studies also show that during the hydrothermal treatment, such events as aggregation, disaggregation and particle growth, occur in series or in parallel with time. At last, the Mg-Al-CO3-LDHs samples (synthesized at 100 degrees C for 24, 36 and 48h) which were acid activated by HCOOH were used to adsorb fluoride ions present in aqueous solution. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:1059 / 1066
页数:8
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